package com.gcc.web;

import com.gcc.pojo.Book;
import com.gcc.pojo.Page;
import com.gcc.service.BookService;
import com.gcc.service.impl.BookServiceImpl;
import com.gcc.utils.WebUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

public class BookServlet extends BaseServlet {

    private BookService bookService=new BookServiceImpl();
    protected void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        int pageNo=WebUtils.parseInt(req.getParameter("pageNo"),0);
        pageNo+=1;
        //1.获取请求的参数  封装成成为book对象
        Book book= WebUtils.copyParamToBean(req.getParameterMap(),new Book());
        //2.调用bookService.addBook()保存图书
        bookService.addBook(book);
        //3.跳到图书列表页面
       // req.getRequestDispatcher("/manager/bookServlet?action=list").forward(req,resp);
        resp.sendRedirect(req.getContextPath()+"/manager/bookServlet?action=page&pageNo="+pageNo);

    }
    protected void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数id,图书编程
       String id= req.getParameter("id");
        //2.调用bookService.deleteBookByid();删除图书
        bookService.deleteBook(Integer.parseInt(id));
        //3.重定向会图书列表管理页面
        resp.sendRedirect(req.getContextPath()+"/manager/bookServlet?action=page&pageNo="+req.getParameter("pageNo"));


    }
    protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数 ==封装成为Book对象
        Book book=WebUtils.copyParamToBean(req.getParameterMap(),new Book());
        //2.调用bookService.updateBook(book);修改图书
        bookService.updateBook(book);
        //3.重定向回图书列表管理界面
        resp.sendRedirect(req.getContextPath()+"/manager/bookServlet?action=page&pageNo="+req.getParameter("pageNo"));
        //4.

    }

    protected void getBook(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数 图书编号
        String id=req.getParameter("id");
        //2.调用bookService.queryBookById 查询图书
        Book book=bookService.queryBookById(Integer.parseInt(id));
        //3.保存图书到request域中
        req.setAttribute("book",book);
        //4.请求转发到 pages/manager/book_edit.jsp页面中
        req.getRequestDispatcher("/pages/manager/book_edit.jsp").forward(req,resp);
    }
    protected void list(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.通过BookService查询全部图书
       List<Book>books= bookService.queryBooks();
        //2.把全部图书保存到request域中
        req.setAttribute("books",books);
        //3.请求转发到/pages/manager/book_manager.jsp
        req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
    }

    //处理分页的功能
    protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数 pageNo 和PageSize
        int pageNo=WebUtils.parseInt(req.getParameter("pageNo"),1);
        int pageSize=WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
        //2.调用BookService.page(pageNo,pagesize)
        Page<Book> page=bookService.page(pageNo,pageSize);
        System.out.println(page.getItems());
        page.setUrl("manager/bookServlet?action=page");
        //3.保存page对象到request域中
        req.setAttribute("page",page);
        //4.请求转发到pages/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
    }
}
